Plumbing fittings, namely, drains; sink drainer system comprised of a drain tray, sink mount, kick stand and rod; drain structures for use in sinks; plumbing fittings, namely, sink strainers, sink traps, and drain fixtures comprised of a drain tube, a drain stopper, and a drain -release lever; plumbing fittings, namely, couplers, valves, bibs, cocks; flexible pipes being parts of sink plumbing installations; stainless steel bottom grids specially adapted and shaped for use in sinks